Adding machine



Patented Jan. 6, 19131` ,PFATENI".4v r01u-ice JOHN; H. wrrrrn, orDUNCAN; oKLAHonA ADDING MACHINE' Application mea reh'raryii, 1928.lsenin No. 253,758;

f This invention relates to adding machines and more particularly'to'aportable adding .machinehaving the form of a holder for penyC1151. f i

An important object of the invention is to provide a simple and readilymanipulatable 'device which may be so constructed that it is very lightand therefore not inconvenient to transport and which will be a generalimm proyeinent in the art.

These and other objects Construction shown in 'the accompanying drawing,whereinfor the purpose of illus tration is showna preferredfembodimentof my il'ive'ntion and wherein Figure 1 is a side elevation of an addinmachine Aconstructed in accordance ,with` my invention; l i

Figure 2 is a vertical sectional 'view there- 2o through on the line21-2 of Figure 1;

Figure 3 is a section on the line 3-3 of Figure 1\;` Figure 4 is adiagrammatic view of the drum wallshowing the indiciaarrangementthereon.

Referring now more particularly to the drawings, the numeral 10indicates-an outer drum having at its opposite endsa cap 11 and 'a plug12. Theplug 12 is constructed to receive a pencil 13 or a 'short portionof a pencil. The drumhas formed in its'periphery a tation within thedrum.' This cylinder has o arrang'edl thereon two number series hereinafter referred'to as the adding series, indi-V cated at 18, and thetotal series, indicatedat 19; The circumference of the cylinder isprovided with ten .equal longitudinal divisions or spaces which, in thepresent illustration, occupy the entire circumference of the cylinder.The adding series consists of digits arranged in circumferentially vandlongitudinally aligned rows in saidfspaces, the digi-ts of these rowsbeingserially dis- 1 attain by the posed in descending order about thecircumference and serially in ascending order longitudinally kofthe-cylinder. For convenience in arrangement, a Zero space 20 is`preferably disposedat the upper left hand corner of the adding serieswith the cylinder 16 developed, as shown `by Figure 4 and from thispoint in .the upper circumferential row, the numbers read from left toright9, 8, 7, 6,5, 4, 8, 2, 1 and from top to bottom 1,2, 3, 4, 5, 6, 7,8, 9,

Vith this as a base, the serial arrangement above vnoted is completed.The zero units are omitted, blank spaces being provided at the pointswhere they would occur in the series andV these blankpoints will, ofcourse, be

disposed iny line "extending: spirally about the cylinder. yAt thispoint, a spiral slot',in` dicated at21, is formedin the cylinder. The

total series consists of a plurality oftens series with their attendantdigits asa zero tens series 22,- v'vhich consists simply of units 0, 1,2, 3, 4, 5, 6, 7 ,8, 9, a one tens series including the numbers 10, 11,12, 18, 14, 15, 16, 17,18 and 19 which is indicated at 23, etc. Eachtens series has its ordinalsso arranged that its units are complementaryto the units of vthe rst circumferential units row of the kaddingseries, with the result that in vertical rows, the numbers of the totalseries have the same terminal unitsas 1,11. 21, 81, 41, 51, etc. 'YMounted in the slot is a slide 24 having a stylus 25 engaging in thegroove 21. `This slide has at its upper end a pointer 26 which coactswith a character series 27 formed along one side of the slot 15 andhaving a.

character forand aligned with each circumferential row of the addingseries.

The slide is preferably further provided with an indicator I extendinglongitudinally of the` drum and longitudinally divided into spaces28preferably defined by forming these surfaces as ratchet teeth. Eachsurface has an'identifying characteristic 29 referring to one ofthe`circumferential rows of the total series 19. 1f desired, the marginof the slot in alignment with the total series may be provided Ywithsimilar identifying characteristics,` asindicated at 30. Thecharacteristics of the" indicator I are serially arranged.

The operation of the, deviceis as follows:

To begin an adding operation, the operator places his thumb upon theuppermost indicat ing space 28 of the slide indicator and posi-- tionsthe slide at the upper limit of its travel, at which time opposite thezero graduation of the indicating series 39 a zero will appear in therow 22 of the total series 19 and the machine is cleared. Assuming thatthe numbers to be added are units 2, 9, Ll, 7, and 8, the operation isas follows: The vertical column appearing in the slot is inspected tofind the unit 2 of the vertical row of the adding series which appearstherein. This unit is opposite the character C of index 27 with whichthe pointer of the slide coacts. The pointer is accordingly moved to thecharacter C. At this time, opposite the zero graduation of the index 30which corresponds to the graduation 29 of the indicator I engaged by theoperators thumb, the character 2 will appear in the slot. In adding thenext number 9, the slot is again inspected to find the unit 9 of the rowof the adding series appearing in thel slot. This is found to beopposite g; the character B. The pointer is accordingly moved upwardlybut before moving the pointer upwardly, the operator moves his thumbdownwardly one notch on the indicator I. After these movements have beencompleted, the sum is read opposite the character 1 of the index 30which corresponds to the vcharacter of the indicator I now engaged bythe thumb of the operator and appears as 11. Following the course aboveindicated, to

rs add the next number, it is found that 4 appears opposite thecharacter F of the index 27, so that the pointer is moved downwardly andno change in the position of the thumb of the operator takes place.Accordingly, when the movement of the pointer is completed, the total isstill read in row 1 and appears as 15. For the next number which isfound to be Vopposite the character C of the index 27, it is againnecesary to move the ,.5 pointer upwardly, so that the thumb of theoperator is again shifted and the total read as 22 in the total seriesopposite the character 2 of the index 30. Adding the next number 8, thiscondition again occurs, as the pointer must be moved upwardly to thecharacter A, so that the thumb of the operator is again shifted and thetotal read opposite 3 of the index 30 and appears as 30.

When two-digit numbers are to be added,

Y' such for instance as 12, 10 and 20, the machine is first cleared bymoving the pointer 26 to the character A of the index 27. The firstvertical column of the adding series 18 and the corresponding columns oftotal series 19 as viewed in Figure t and counting from left to right,are now in registration with the slot 15 of the drum 10. The index 27 isinspected to ascertain the character thereof appearing opposite thedigit 2 of the rst ver- 'F tical column of the adding series 18, thisdigit corresponding to the second digit of the numeral 12, and thischaracter being the letter C. The pointer 26 is moved to the character Cof the index 27 with the thumb on the character 1 of the indicator I,the character 1 corresponding to the first digit of the number 12. Thethird vertical column of the total series 19 is moved into registrationwith the slot 15 of the drum 10, as the result of this movement of thepointer 26. The character lof the indicator I, also corresponds to t-hecharacter 1 of the index 30 opposite which character of the indexappears the number 12 of the third vertical column of the total series19. As the first digit of the number 10 is 1, the thumb is moved onespace downwardly on the indicator I, the thumb being now on thecharacter 2 of the indicator. This character corresponds to thecharacter 2 of the index 30, and the number 22, representing the totalof the numbers 12 and 10, of the third vertical column of the totalseries 19 appears opposite this character. As the first digit of thenumber is 2, the thumb is moved downwardly two spaces on the indicatorI, the thumb being now on the character 4C of the indicator I. Thischaracter corresponds to the character el of the index 30 opposite whichappears the number 42, the total sought, of the third vertical column ofthe total series 19.

It will be obvious that the device may not only be very cheaply andreadily produced, but provides a novel and efficient means for addingsmall sums. It will also be obvious that the construction hereinbeforeset forth is capable of a. certain range of change and modificationwithout materially departing from the spirit of the invention and Iaccordn ingly do not limit myself to such specific structure except ashereinafter claimed.

I claim 1. In an adding machine, a drum provided with a longitudinalslot and with a longitudinal index at one side of the slot, a cylinder Irotatably mounted in the drum and provided with an adding series ofnumbers and a total series of numbers, one of said series being arrangedabove the other and a row of each series registering with the slot ofthe drum, a slide mounted in said slot for movement in oppositedirections longitudinally with respect to the adding series and intoregistration with the several numbers of said series that are to beadded, means connecting the slide to the drum to permit the movement ofthe slide to turn the drum, and an indicator fixed to the slide andextending longitudinally of the drum, the indicator providing means bywhich the slide may be moved by the linger and provided with an indexsimilar to said first index, the character at one end of the indicatorbeing covered by the finger during the initial movement of the slide andthe finger being moved on the indi- I-Bii for each movement of the slidein one direction, Aand the character of said first index correspondingto the one covered by the finger after the final movement of the slideindicating in the total series the sum of the numbers added.

2. In an adding machine, a drum provided with a longitudinal slotandwith a longitudinal index at one side of the slot, a cylinder rotatablymounted in the drum and provided With an adding series of numbers and atotal series of numbers, one of said series being arranged above theother and a rovv of each series registering with the slot of the drum, aslide mounted in said slot for movement in opposite directionslongitudinally With respect to the adding series and into registrationwith the several numbers of said series that are to be added,thecylinder being provided With a spiral groove bisecting the addingseries, ak stylus carried by the slide of for each movement of the slidein one direction, and the character of said first index corresponding tothe one covered by the finger after the final movement of the slideindicating in the total series the sum of the numbers added, the drumbeing provided with a longitudinal index at one side of the slot, and apointer carried by the slide, said last index and pointer facilitatingthe movement of the slide into registration with those movements oftheadding seriesto be added.

In testimony whereof I hereunto aix my signature.

JOHN H. WHITE.

and iitting in the groove to permit the movement of the slide to turnthe drum, and an indicator fixed to the slide and extendinglongitudinally of the drum, the indicator providing means by which theslide may be moved by the finger and provided vvithan index similar tosaid first index, the character at one end of the indicator beingcovered by the finger during the initial movement of the slide and thenger being moved on the indicator in the direction of the other endthereof for each movement of the slide in one direction, and thecharacter of said first index corresponding to the one covered by thefinger after the final movement of the slide indicating in the totalseries the sum of the numbers added. f

3. In an adding machine, a drum provided With a longitudinal slot andWith a longitudinal index at one side of the slot, a cylinder rotatablymounted in the drum and provided vvith an adding series of numbers and atotal series of numbers, one of said series being arranged above theother and a rovv of each series registering With the slot of thel drum,a slide mounted in said slot for movement in opposite directionsylongitudinally with respect to the adding series and into registrationWith the several numbers of said series that are to be added, thecylinder being provided with a spiral groove bisecting the addingseries,a stylus carried by the slide and fitting in the .groove to permit themovement vof the slide to turn the drum, an indicator fixed to the slideand extending longitudinally of the drum, the indicator providing meansby which the slide may be moved by the finger and provided With an indexsimi-v lar to said first index, the character at one end of theindicator being covered by kthe finger during the initial movement ofthe slide and the linger being moved on the indicator in the directionof the other end there-

